20522455 has 4 divisors (see below), whose sum is σ = 24626952. Its totient is φ = 16417960.

The previous prime is 20522449. The next prime is 20522477. The reversal of 20522455 is 55422502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20522455 - 2⁵ = 20522423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052241 + ... + 2052250.

It is an arithmetic number, because the mean of its divisors is an integer number (6156738).

Almost surely, 2^20522455 is an apocalyptic number.

20522455 is a deficient number, since it is larger than the sum of its proper divisors (4104497).

20522455 is an equidigital number, since it uses as much as digits as its factorization.

20522455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104496.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20522455 is about 4530.1716303028. The cubic root of 20522455 is about 273.7850757443.

Adding to 20522455 its reverse (55422502), we get a palindrome (75944957).

The spelling of 20522455 in words is "twenty million, five hundred twenty-two thousand, four hundred fifty-five".